ipsec: T2816: IPSec python rework, includes DMVPN and VTI support

1 files changed, 110 insertions, 0 deletions

diff --git a/src/conf_mode/vpn_rsa-keys.py b/src/conf_mode/vpn_rsa-keys.py
new file mode 100755
index 000000000..a0e2e2690
--- /dev/null
+++ b/src/conf_mode/vpn_rsa-keys.py
@@ -0,0 +1,110 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2021 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import base64
+import os
+import struct
+
+from sys import exit
+
+from vyos.config import Config
+from vyos.util import call
+from vyos import ConfigError
+from vyos import airbag
+from Crypto.PublicKey.RSA import construct
+
+airbag.enable()
+
+LOCAL_KEY_PATHS = ['/config/auth/', '/config/ipsec.d/rsa-keys/']
+LOCAL_OUTPUT = '/etc/ipsec.d/certs/localhost.pub'
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['vpn', 'rsa-keys']
+    if not conf.exists(base):
+        return None
+
+    return conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, no_tag_node_value_mangle=True)
+
+def verify(conf):
+    if not conf:
+        return
+
+    if 'local_key' in conf and 'file' in conf['local_key']:
+        local_key = conf['local_key']['file']
+        if not local_key:
+            raise ConfigError(f'Invalid local-key')
+
+        if not get_local_key(local_key):
+            raise ConfigError(f'File not found for local-key: {local_key}')
+
+def get_local_key(local_key):
+    for path in LOCAL_KEY_PATHS:
+        if os.path.exists(path + local_key):
+            return path + local_key
+    return False
+
+def generate(conf):
+    if not conf:
+        return
+
+    if 'local_key' in conf and 'file' in conf['local_key']:
+        local_key = conf['local_key']['file']
+        local_key_path = get_local_key(local_key)
+        call(f'sudo /usr/bin/openssl rsa -in {local_key_path} -pubout -out {LOCAL_OUTPUT}')
+
+    if 'rsa_key_name' in conf:
+        for key_name, key_conf in conf['rsa_key_name'].items():
+            if 'rsa_key' not in key_conf:
+                continue
+
+            remote_key = key_conf['rsa_key']
+
+            if remote_key[:2] == "0s": # Vyatta format
+                remote_key = migrate_from_vyatta_key(remote_key)
+            else:
+                remote_key = bytes('-----BEGIN PUBLIC KEY-----\n' + remote_key + '\n-----END PUBLIC KEY-----\n', 'utf-8')
+
+            with open(f'/etc/ipsec.d/certs/{key_name}.pub', 'wb') as f:
+                f.write(remote_key)
+
+def migrate_from_vyatta_key(data):
+    data = base64.b64decode(data[2:])
+    length = struct.unpack('B', data[:1])[0]
+    e = int.from_bytes(data[1:1+length], 'big')
+    n = int.from_bytes(data[1+length:], 'big')
+    pubkey = construct((n, e))
+    return pubkey.exportKey(format='PEM')
+
+def apply(conf):
+    if not conf:
+        return
+
+    call('sudo /usr/sbin/ipsec rereadall')
+    call('sudo /usr/sbin/ipsec reload')
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)